I feel at least MS/Activision 'should' include a 14 day Gold pass like MS did with Halo 4. That way the non-commited can play the campaign and then put a solid few weeks into the zombies/MP before moving on.

Anyone that has had a 360 for a decent period of time should have a handful of 48hr codes to use at their discretion for when they feel like playing MP. I know I have about a dozen or so weekends worth should i give up the subbie down the road.